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For a city population record for past decades were found as follows. Estimate
| Year | Population |
|---|---|
| 1990 | 11000 |
| 2000 | 16000 |
| 2010 | 22500 |
A Sewer has a diameter of 300 mm and slope in 1 in 400. While running full it has mean velocity of 0.7 m/s. If both the diameter and slope are 600 mm and 1 in 200. What will be the changed mean velocity when running half full? Assume suitable data if necessary.
Design a plain sedimentation tank for a water supply scheme having capacity 10 MLD having Detention time 5 hours ,Velocity of flow 0.20 m/min ,Water depth 3.5 m and Free board 0.5 m . Assume suitable data if necessary.
An industrial waste water enters a stream having a BOD concentration of 10 mg/l and flow of 20 m³/s. if the flow of waste water is 1.5 m³/s and its BOD concentration is 250 mg/l then the BOD concentration in the stream at a point of confluence of wastewater with the stream will be. Assume suitable data if necessary
A sample of sewage is estimated to have a 5 day 20 ºC BOD of 250 mg/l .if the test temperature be 30ºC in how many days will be the same value of BOD be obtained?
Explain sanitary land filling? Describe the different factors to be considered for the site selection of sanitary land filling.
Design a primary settling tank of rectangular shape for a town having population of 40000 with water supply of 135 l/c/day. Assume 80 % of water supplied to the town is converted to wastewater and detention period 2 hr, SOR is 30 m³/m²/day take L/B=4. Assume suitable data if necessary.
BE Civil
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Official Gujarat Technological University (GTU) examination paper for Environmental Engineering (Summer 2026, B.E. · Civil Engineering, Sem 6). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.
3160611 Environmental Engineering
Official GTU PDF · Summer 2026
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